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"So, this is your way of taking care of things -- to dig in a spot that I never said to," Shermantine wrote. "I did not send you to the area you are digging in. You planned to come up empty-handed the whole time. This way, you can claim my information is no good."

The FBI is continuing to search for possible victims of the Speed Freak Killers. The other person responsible for the dozens of methamphetamine-fueled killings that took place in the late '80s and early '90s is Loren Herzog.

Herzog was released from prison after his murder convictions were overturned on the basis of improper police work.

Herzog hanged himself at a home on the property of the High Desert State Prison, not long after Shermantine began telling investigators where they could find victims' bodies.

In regards to the most recent Shermantine letter, the FBI told KCRA 3 in a statement: "Shermantine’s recollections have occasionally proved to be inaccurate, and only with thorough investigation and careful consideration have we been able to locate a site that offers the best chance of recovering victim remains."

Shermantine has also called Sacramento bounty hunter Leonard Padilla.

"He said they are a good 200 feet away from where he told them (to) search," Padilla said. "He has been 100 percent accurate so far."

Wrote Shermantine to the FBI: "You guys have been walking all over bodies out there in the ground."

The FBI has already spent two weeks preparing the area for the technical and hazardous excavation work.

Crews said they drilled a hole and collected a core sample 75 feet deep, and still have not found the bottom of the well.

A camera lowered into the small test hole only revealed fill dirt, according to the FBI.

Workers with Drill Tech Drilling and Shoring Inc. have started drilling a larger hole next to the well.

The FBI’s Evidence Response Team will be lowered into the second hole where they will work, while excavating the adjacent well.

The digging will all be done by hand -- and material will be sent to the surface for further sifting and analysis, according to the FBI.

Investigators began looking at the well after Shermantine, during a brief release from San Quentin’s death row, led investigators to possible dumping grounds he called “Loren’s Boneyard.”